The Yuasa SWL1850-12FR Battery Flame Retardant from Critical Power Supplies. The SWL range is an enhanced NPL design resulting in an improved energy to density ratio, giving up to 40% extra discharge capacity. All other attributes and operational characteristics are the same, thereby maintaining the benefit of a common mechanical and electrical design for users of both products.Note: Image shown is not the SWL1850-12FR but a similar battery.h2. Features and Benefits.- Yuasa VRLA batteries can be used in any orientation excluding continuous use inverted.- Standard case material is flame retardant to (UL94) HBØ.- FR option case material is flame retardant to UL94:VØ (oxygen index 30).- SWL batteries are manufactured in factories that comply with ISO9001:2000.- FR option SWL’s comply with BS6290 Part 4 (1997).- SWL batteries comply with IEC 60896-21+22.Charging Methods (At 20°C)Standby use: Float charging voltage 2.275vpcCAUTIONAvoid short circuit.Do not charge in a sealed container.Service life and operational characteristics will be affected by temperature.AC Ripple reduces service life.|. Description | Information || Nominal Voltage | 12 || Nominal Wattage/Cell | || 10 min to 1.6V/Cell | – || 5 min to 1.6V/Cell | – || 3 min to 1.6V/Cell | – || Weight (Approx)/Kg | 23.5 || Energy Density (Wh/L) | 90 || Specific Energy | || (Wh.kg) 10HR 36 | 40 || Internal Resistance | || (Approx)/mohm | 1.6 || Maximum (1 min) | || discharge Current/A | 500 || Maximum Short Duration || Discharge Current in Amperes | 800 || Operating Temperatures/°C | || Charge | -15 to 50 || Discharge | -20 to 60 || Percentage Charge Retention at 20°C | || 1 month | 97 || 3 months | 91 || 6 months | 85 || Standard Terminal Type | Lead Post with Brass insert C || Torque Nm | 4.76 || Case Material | ABS || Dimensions / mm || Length +/-1 | 350 || Width +/-1 | 166 || Height +/-2 | 174 |